ACE Weekly 12/27/02 - 01/02/03

All ACE spacecraft subsystems are performing nominally. No attitude 
maneuver was performed this week. The next maneuver is scheduled for 01/09/03.

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OCRs Executed:

NONE

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Ongoing Activities:

Trending, Analysis and Plotting System (TAPS) development 
continues.  VC2/VC4 processing problems continue.  TAPS #1 has been turned 
over to development to troubleshoot the problem.  TAPS #2 is to be loaded 
with TAPS 4.0.4 to allow testing on other areas to continue.

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The HGA Angle Constraint Report is undergoing final revision.

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Anomalies:

DOY 02361 (12/27/2002)-ACE Anomaly #G02-0141 TPOCC Erroneous Limit Messages
TPOCC generated a 2nd red low limit message for SSS2KAV and SSS2KBV without 
an intervening "return within limits" message.  At 16:13:58 SSS2KBV entered 
the red low limit at a value of 0.0588.  Then at 16:15:49 SSS2KAV entered 
the red low limit at a value of 0.  Both of these mnemonics had already 
entered the low limit at a value of 0 at 15:27:22 when the downlink format 
changed to science. These erroneous messages also occurred on Day 02341.
IMPACT: None.  SSS2KAV and SSS2KBV have been verified to be at 0V.

DOY 02363 (12/29/2002)-ACE Anomaly #G02-0142 GDS(DSS-66) CPA Swap/Loss of TLM
DSS-66 had problems with an exciter which caused a delay in commanding for 
8 minutes.  Then they encountered problems with CPA 4.  DSS-66 swapped the 
CPA and the problem was corrected.  IMPACT: None.  Commanding was delayed 
but all pass objectives were accomplished.  DR#M101267

DOY 02365 (12/31/2002)-ACE Anomaly #S02-0031 INT_LINES_A_T YL Limit Violation
At 18:10:44 INT_LINES_A_T violated yellow limit (10) with a value of 9.6472.
At 18:10:59 INT_LINES_A_T returned to within limits. This has occurred 
before.  Reference AR S02-0024.  The FOT is still investigating this.  It 
does not look like a temperature fluctuation, but more like something with 
the temperature sensor.  IMPACT:  Unknown at this time.

DOY 03001 (01/01/2003)-ACE Anomaly #G03-0001 GDS(DSS-66) TGC Reboot
At 12:15, DSS-66 called to see if telemetry was online.  At that time there 
was no telemetry online at the MOC.  DSS-66 said they would look into the 
problem.  At 12:20, DSS-66 said they saw telemetry leaving the 
station.  JPL Comm also saw telemetry coming from the station. Contacted 
IPNOCC, they only saw data incrementing on the Command Echo or Monitor 
data.  DSS-66 then performed a hardware reset on the Telemetry Group 
Controller (TGC).  Telemetry was online at 12:28.  IMPACT: None. All data 
recovered during pass.  DR#M101274




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
Honeywell Technology Solutions Inc.

ACE Flight Operations Team
Goddard Space Flight Center
Building 14, Room W10A
Mail Stop 428.2
Greenbelt, MD 20771

Office: 301-286-7071
Pager: 800-425-3174
Fax:    301-286-1729
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~